SACRAMENTO — A citrus disease that has killed millions of citrus trees across Florida and Brazil has been detected in California, despite the industry’s best efforts to keep it at bay.

The California Department of Food and Agriculture announced Friday that citrus greening, also known as huanglongbing, has been discovered in lemon/pummelo tree in a residential neighborhood of Los Angeles County.

The bacterial disease is carried by the Asian citrus psyllid and attacks the vascular system of trees. It is not a threat to humans.

State officials are making arrangements to remove and dispose of the tree. They also will treat citrus trees within 800 meters of the infected tree.

Psyllids can become vectors of the disease by feeding on an infected tree.